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3.4 percent increase or decrease

3.4 percent increase or decrease - 20 0.20 New = Orig x(1...

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3.4 Percent Increase or Decrease
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percent change Original Number x (1 ± Percent Change) = New Number If Percent Change is… …an INCREASE …a DECREASE + Percent Change Percent Change Percent Change = Amount of Change Original Number
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36 increased by 25% is what number? Orig. # = New # = % Change = = 36 ? + 25% + 0.25 New # = Orig. # x (1 ± % Change) = 36 x (1 + 0.25) = 36 x 1.25 = 45 Change is 25% increase of 36
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16.67% What percent less than $210 is $175 Orig. # = New # = % Change = 210 175 ? Amount before the change is $210 Amount of Change = 210 − 175 = 35 Number Original Change of Amount Change Percent = 210 35 = 6 0.1 =
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What sum of money increased by 175% amounts to $143? Orig. # = New # = % Change = = ? 143 + 175% + 1.75 Change is 175% increase of ? New # = Orig. # x (1 ± % Change) Change) % (1 # New # Orig. ± = 1.75 1 143 + = 2.75 143 = 52 =
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What number is 20% less than 900? 25% 25% 25% 25% A. 720 B. 180 C. 1,080 D. 880
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= 720 What number is 20% less than 900? Orig. # = New # = % Change = = 900
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Unformatted text preview: ?- 20%- 0.20 New # = Orig. # x (1 ± % Change) = 900 x (1 - 0.20) = 900 x 0.80 Change is 20% decrease of 900 $2,025 is what percent more than $2,000? 25% 25% 25% 25% A. 1.25% B. 98.77% C. 12.35% D. 101.25% $2,025 is what percent more than $2,000? Orig. # = New # = % Change = 2,000 2,025 ? Amount before the change is $2,000 Amount of Change = Number Original Change of Amount Change Percent = 2,000 25 = 0.0125 = 1.25% = 2,025 − 2,000 = 25 The number 605 is 37½% more than what number? 25% 25% 25% 25% A. 832 B. 227 C. 1,613 D. 440 440 = The number 605 is 37½% more than what number? Orig. # = New # = % Change = = ? 605 + 37.5% + 0.375 Change is 37.5% increase of ? New # = Orig. # x (1 ± % Change) Change) % (1 # New # Orig. ± = 0.375 1 605 + = 1.375 605 = HOMEWORK: Text Sect. 3.4: A) 1, 3, 5 C) 3, 5 D) 1, 3 LAB 5 # 3 - 7...
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